CN217183059U

CN217183059U - Stator winding and flat wire motor

Info

Publication number: CN217183059U
Application number: CN202220978408.6U
Authority: CN
Inventors: 程麒; 董大为; 赵帅; 夏伟; 于文魁; 忻国祥
Original assignee: Marvel Power Control Technology Shanghai Co ltd; Beijing Mawei Electric Power Technology Co ltd
Current assignee: Marvel Power Control Technology Shanghai Co ltd; Beijing Mawei Electric Power Technology Co ltd
Priority date: 2022-04-26
Filing date: 2022-04-26
Publication date: 2022-08-12
Anticipated expiration: 2032-04-26

Abstract

The utility model relates to a stator winding and flat wire motor, include: the stator is arranged in an annular structure, and a stator groove is radially and concavely formed in the inner annular wall of the stator; and at least two conducting wires, wherein the at least two conducting wires are arranged in the stator slot in a layered mode along the radial direction, the conducting wire closest to the inner diameter side of the stator comprises at least two conductors, and the at least two conductors are connected in parallel. Because the lead closest to the inner diameter side of the stator is designed to comprise at least two conductors, and the diameters of the conductors are smaller than those of the conductors of other layers of leads, the skin effect generated when current is introduced into the conductors can be weakened, and then the extra alternating current resistance can be reduced, and the effect of reducing or even inhibiting the generation of the alternating current loss is achieved. Compared with the prior art, the stator winding can effectively reduce alternating current loss, and work efficiency of the flat wire motor is guaranteed and improved.

Description

Stator winding and flat wire motor

Technical Field

The utility model relates to the technical field of electric machines, especially, relate to a stator winding and flat wire motor.

Background

At present, along with new energy automobile's driving system is increasingly high to the requirement of motor speed, the problem that traditional flat wire motor's stator winding is high at the partial AC loss of winding is more and more outstanding, and especially when the flat wire motor is in high rotational speed operating mode, stator winding's AC loss can occupy the more than 30% of flat wire motor total loss, if can effectively reduce the AC loss of flat wire motor at high-speed operating mode, so just so to improve the regional area of flat wire motor high efficiency at to a great extent.

The reason why the stator winding generates ac loss is: because the sectional area of the flat wire conductor is large, a skin effect can be generated when the flat wire conductor is connected with current, the skin effect is more obvious along with the increase of the current and the current frequency, and the flat wire conductor can generate extra alternating current resistance so as to generate alternating current loss. At present, no effective method capable of solving the problem of large alternating current loss of the stator winding exists in the market.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a stator winding and a flat wire motor, and the problem that the ac loss of the stator winding in the prior art is large, and the working efficiency of the flat wire motor is affected is solved.

In one aspect, the present application provides a stator winding comprising:

the stator is arranged in an annular structure, and a stator groove is radially and concavely formed in the inner annular wall of the stator; and

the stator comprises at least two conducting wires, wherein the conducting wires are arranged in stator slots in a layered mode along the radial direction, the conducting wire closest to the inner diameter side of the stator comprises at least two conductors, and the conductors are connected in parallel.

In the stator winding of the scheme, the inner annular wall of the stator is concavely provided with the stator slot, and the stator slot can be used for winding a lead to prepare a finished product of the stator winding. At least two wires are installed in the stator slot and are arranged in the stator slot in a layered mode along the radial direction, wherein the wire closest to the inner diameter side of the stator is designed to comprise at least two conductors, and the diameters of the conductors are smaller than those of the conductors of other layers of wires, so that the skin effect generated when current is led into the conductors can be weakened, extra alternating current resistance can be reduced, and the effect of reducing or even inhibiting the generation of alternating current loss is achieved. Compared with the prior art, the stator winding can effectively reduce alternating current loss, and work efficiency of the flat wire motor is guaranteed and improved.

The technical solution of the present application is further described below:

in one embodiment, at least two of the conductors are arranged in sequence along a circumferential direction of the stator.

In one embodiment, at least two of the conductors are arranged in sequence along a radial direction of the stator.

In one embodiment, the wire closest to the inner diameter side of the stator comprises a plurality of conductors, and the plurality of conductors are regularly or irregularly arranged in a plane area from the notch to the bottom of the stator slot.

In one embodiment, at least two layers of the conductive wires include at least two conductors along the direction from the inner diameter side to the outer diameter side of the stator.

In one embodiment, the number of the conductors included in each layer of the conductive lines is the same or different.

In one embodiment, the area of at least two conductors contained in each layer of the conducting wire is equal or unequal; the area of the conductors contained in any adjacent or spaced conducting wire is equal or unequal.

In one embodiment, the conductor further comprises an insulating protective layer, and the insulating protective layer is wrapped outside the conductor.

In one embodiment, at least one side of the slot opening edge of the stator slot is convexly provided with a limiting body towards the middle of the slot opening, and the limiting body is in direct or indirect limiting and abutting joint with the conducting wire closest to the inner diameter side of the stator.

In another aspect, the present application also provides a flat wire electric machine comprising a stator winding as described above.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a stator winding according to an embodiment of the present application;

FIG. 2 is a schematic view of the first embodiment of the stator with the wires mounted in the slots;

FIG. 3 is a schematic view of a second embodiment of the stator with wires mounted in slots;

fig. 4 is a schematic structural view of a stator with wires mounted in slots of the stator according to a third embodiment.

Description of reference numerals:

100. a stator winding; 10. a stator; 11. a stator slot; 12. a limiting body; 20. a wire; 21. a conductor.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

Referring to fig. 1 to 4, a stator winding 100 according to an embodiment of the present invention includes: the stator 10 and the at least two wires 20, as well as other components for the stator winding, are not described in additional detail herein, since they do not interfere with the teachings of this patent. The stator 10 (motor stator 10) is an important component of a motor, such as a motor, a generator, or a starter. The stator 10 is mainly assembled from a stator 10 core. The stator 10 is typically used in conjunction with a rotor. The main function of the stator 10 is to generate a rotating magnetic field, and the main function of the rotor is to cut magnetic lines of force in the rotating magnetic field to generate a rotating electromagnetic torque.

In this embodiment, the stator 10 is disposed in an annular structure, and the inner annular wall of the stator 10 is radially recessed with stator slots 11. Specifically, the stator slots 11 are provided in plural, the plural stator slots 11 are arranged on the inner annular wall of the stator 10 at equal intervals in the circumferential direction, and each stator slot 11 can be wound with the conducting wire 20 to realize the performance of the stator winding 100.

The shape, size and other parameters of the stator slot 11 can be flexibly selected according to actual needs. For example, the stator slots 11 are rectangular in shape in this embodiment. Of course, the stator slots 11 in other embodiments may be any one of triangular, semicircular, trapezoidal, etc.

At least two of the wires 20 are disposed in the stator slot 11 and arranged in layers along a radial direction, and the wire 20 closest to an inner diameter side of the stator 10 includes at least two conductors 21, and at least two of the conductors 21 are connected in parallel. It should be noted that the diameter of the conducting wire 20 is consistent with the width of the stator slot 11, so that the slot wall of the stator slot 11 can directly or indirectly contact with the outer wall of the conducting wire 20, thereby positioning the conducting wire 20 and ensuring that the conducting wire 20 is stably installed and is not easy to loosen.

In summary, the implementation of the technical solution of the present embodiment has the following beneficial effects: in the stator winding 100 of the above-mentioned scheme, the inner annular wall of the stator 10 is concavely provided with the stator slots 11, and the stator slots 11 can be used for winding the wires 20 to manufacture the finished product of the stator winding 100. At least two wires 20 are installed in the stator slot 11, and the at least two wires 20 are arranged in layers in the radial direction in the stator slot 11, wherein the wire 20 closest to the inner diameter side of the stator 10 is designed to include at least two conductors 21, and the diameter of the conductor 21 is smaller than the diameter of the conductor 21 of the other layer of wire 20, so that the skin effect generated when current is introduced into the conductor 21 can be reduced, and further, the extra alternating current resistance can be reduced, and further, the effect of reducing or even inhibiting the generation of the alternating current loss can be achieved. That is to say, compare in prior art, the stator winding 100 of this scheme can effectively reduce the alternating current loss, guarantee and promote the work efficiency of flat line motor.

The number of the conductive wires 20 may be set according to actual needs, for example, 3, 4, 5 layers. For example, the lead wires 20 are provided in 4 layers in the present embodiment, that is, the lead wire 20 closest to the inner diameter side of the stator 10 is the first layer, and the lead wire 20 closest to the outer diameter side of the stator 10 is the fourth layer.

Also, the number of the wires 20 per layer is limited to at least one, and two or more wires may be provided at the same time according to actual needs.

The cross-sectional shape of the conductor 21 may be, but is not limited to, any one of circular, square, and the like. The conductor 21 may be a copper wire or other material wire.

With continued reference to fig. 2, in some embodiments, at least two of the conductors 21 are sequentially arranged along the circumferential direction of the stator 10. Alternatively, with continuing reference to fig. 3, as an alternative to the above embodiment, at least two of the conductors 21 are arranged in sequence along the radial direction of the stator 10. Both of the two modes can compactly arrange at least two conductors 21 in the limited space of the stator slot 11, and the conductors 21 are wound in parallel, and the area of the conductors 21 is smaller than that of the conventional conductors 21, so that the skin effect generated after the power is on can be reduced, and the efficiency of the flat-wire motor at the height end is improved.

It should be noted that at least two conductors 21 arranged in sequence in the annular direction or the radial direction may be on the same straight line or arc line, or may be arranged in a staggered manner, which may be selected according to actual needs.

Further, on the basis of the above embodiment, the lead wire 20 closest to the inner diameter side of the stator 10 includes a plurality of conductors 21, and the plurality of conductors 21 are regularly or irregularly arranged in the planar region from the notch to the bottom of the stator slot 11. In this way, under the condition that the cross-sectional dimension of stator slot 11 is constant (that is, the cross-sectional area of lead 20 is constant), a larger number of conductors 21 are arranged, so that the diameter of a single conductor 21 can be smaller, thereby further reducing the skin effect generated after power is supplied, reducing the additional generated alternating current resistance, and reducing or even inhibiting the generation of alternating current loss.

Further, in any of the above embodiments, at least two layers of the conductive wires 20 include at least two conductors 21 along the direction from the inner diameter side to the outer diameter side of the stator 10. As is clear from the simulation results, the distribution of the current loss at the stator winding 100 gradually decreases from the inner diameter side of the stator 10 to the outer diameter side of the stator 10, and therefore, by replacing the conductors 21 of the wires 20 of each layer with a large number and a small diameter along the direction from the inner diameter side to the outer diameter side of the stator 10, the skin effect can be gradually reduced in the radial direction, the generated extra ac resistance can be reduced, and the ac loss of the stator winding 100 can be further reduced.

According to actual needs, the number of the conductors 21 included in each layer of the conductive wires 20 is the same or different. Thus, the product can be diversified, and the use occasions with different performances for the stator winding 100 can be satisfied.

Furthermore, in some embodiments, the area of at least two of the conductors 21 included in each layer of the conductive wires 20 is equal to or unequal; the area of the conductors 21 included in any adjacent or spaced-apart wires 20 is equal or unequal. Thus, the product can be diversified, and the use occasions with different performances for the stator winding 100 can be satisfied.

Preferably, the conductors 21 of each layer of wires 20 and the conductors 21 of each layer of wires 20 are designed with the same diameter, so as to reduce the manufacturing difficulty. Alternatively, the conductors 21 of each layer of wires 20 and the conductors 21 of each layer of wires 20 are conductors 21 with increasing sizes, and the conductors 21 in each wire 20 are arranged in a spiral, zigzag, scattering, or other structure.

In order to ensure the insulating property of the product, prevent the occurrence of potential safety hazard due to electric leakage, and ensure the working performance of the wire 20, in some embodiments, the wire 20 further includes an insulating protective layer wrapped around the conductor 21. For example, the insulating protective layer may be any one of a rubber layer, a peek layer, a polyester imide, a polyimide, and the like. In addition, in order to enhance the insulation protection capability, the number of the insulation protection layers can be two or more than two, and the number of the insulation protection layers can be selected according to actual needs.

In practical processing, after the conducting wire 20 is wound into the stator slot 11, the conducting wire 20 is required not to be pulled out from the stator slot 11 under the mutual pressing force, so as to ensure the structural stability of the stator winding 100. In view of this, in some embodiments, at least one side of the slot 11 is provided with a stopper 12 protruding toward the middle of the slot, and the stopper 12 is in direct or indirect stopping abutment with the conducting wire 20 closest to the inner diameter side of the stator 10.

The limiting body 12 extends towards the direction of the notch of the stator slot 11, so that part of notch sealing covers can be abutted to the lead 20 closest to the inner diameter side at the same time, the freedom degree of the lead 20 is limited, and the lead 20 in the stator slot 11 is prevented from being separated from the notch.

Preferably, the notch edges of two opposite sides of the stator slot 11 are provided with the limiting bodies 12, so as to improve the reliability of limiting the conducting wire 20. Optionally, the position-limiting body 12 may be integrally formed with the slot wall of the stator slot 11, or may be detachably assembled, and may be selected according to actual needs. The specific structure and shape of the stop body 12 may also be designed according to actual needs. For example, the spacing body 12 in this embodiment is a ratchet structure.

In addition, the present application also provides a flat-wire motor including the stator winding 100 according to any of the above embodiments.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims

1. A stator winding, comprising:

2. A stator winding according to claim 1, wherein at least two of the conductors are arranged in sequence along a circumferential direction of the stator.

3. A stator winding according to claim 1, wherein at least two of the conductors are arranged in sequence in a radial direction of the stator.

4. A stator winding according to claim 1, wherein the wire closest to the inner diameter side of the stator comprises a plurality of conductors arranged regularly or irregularly in the slot-to-slot bottom planar area of the stator slot.

5. A stator winding according to claim 1, wherein at least two layers of said conductive wires comprise at least two of said conductors in a direction from an inner diameter side to an outer diameter side of said stator.

6. A stator winding according to claim 5, wherein the number of conductors included in each layer of the conductor wire is the same or different.

7. The stator winding according to claim 5, wherein the area of at least two conductors contained in each layer of the conducting wires is equal or unequal; the area of the conductors contained in any adjacent or spaced conducting wire is equal or unequal.

8. A stator winding according to claim 1, wherein the wire further comprises an insulating protective layer surrounding the exterior of the conductor.

9. A stator winding according to claim 1, wherein at least one side of the slot opening edge of the stator slot is convexly provided with a limiting body towards the middle of the slot opening, and the limiting body is in direct or indirect limiting abutment with the conducting wire closest to the inner diameter side of the stator.

10. A flat wire electrical machine comprising a stator winding according to any one of claims 1 to 9.